x86/dumpstack: Remove dump_trace() and related callbacks

All previous users of dump_trace() have been converted to use the new
unwind interfaces, so we can remove it and the related
print_context_stack() and print_context_stack_bp() callback functions.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Byungchul Park <byungchul.park@lge.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nilay Vaish <nilayvaish@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/5b97da3572b40b5a4d8e185cf2429308d0987a13.1474045023.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/include/asm/stacktrace.h b/arch/x86/include/asm/stacktrace.h
index c9ccf06..37f2e0b 100644 (file)
--- a/arch/x86/include/asm/stacktrace.h
+++ b/arch/x86/include/asm/stacktrace.h
@@ -45,42 +45,6 @@ static inline bool on_stack(struct stack_info *info, void *addr, size_t len)
 
 extern int kstack_depth_to_print;
 
 
 extern int kstack_depth_to_print;
 

-struct thread_info;
-struct stacktrace_ops;
-
-typedef unsigned long (*walk_stack_t)(struct task_struct *task,
-                                     unsigned long *stack,
-                                     unsigned long bp,
-                                     const struct stacktrace_ops *ops,
-                                     void *data,
-                                     struct stack_info *info,
-                                     int *graph);
-
-extern unsigned long
-print_context_stack(struct task_struct *task,
-                   unsigned long *stack, unsigned long bp,
-                   const struct stacktrace_ops *ops, void *data,
-                   struct stack_info *info, int *graph);
-
-extern unsigned long
-print_context_stack_bp(struct task_struct *task,
-                      unsigned long *stack, unsigned long bp,
-                      const struct stacktrace_ops *ops, void *data,
-                      struct stack_info *info, int *graph);
-
-/* Generic stack tracer with callbacks */
-
-struct stacktrace_ops {
-       int (*address)(void *data, unsigned long address, int reliable);
-       /* On negative return stop dumping */
-       int (*stack)(void *data, const char *name);
-       walk_stack_t    walk_stack;
-};
-
-void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
-               unsigned long *stack, unsigned long bp,
-               const struct stacktrace_ops *ops, void *data);
-

 #ifdef CONFIG_X86_32
 #define STACKSLOTS_PER_LINE 8
 #else
 #ifdef CONFIG_X86_32
 #define STACKSLOTS_PER_LINE 8
 #else

diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index c08f32a..999de3b 100644 (file)
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -56,92 +56,6 @@ void printk_address(unsigned long address)
        pr_cont(" [<%p>] %pS\n", (void *)address, (void *)address);
 }
 
        pr_cont(" [<%p>] %pS\n", (void *)address, (void *)address);
 }
 

-/*
- * x86-64 can have up to three kernel stacks:
- * process stack
- * interrupt stack
- * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
- */
-
-unsigned long
-print_context_stack(struct task_struct *task,
-               unsigned long *stack, unsigned long bp,
-               const struct stacktrace_ops *ops, void *data,
-               struct stack_info *info, int *graph)
-{
-       struct stack_frame *frame = (struct stack_frame *)bp;
-
-       /*
-        * If we overflowed the stack into a guard page, jump back to the
-        * bottom of the usable stack.
-        */
-       if ((unsigned long)task_stack_page(task) - (unsigned long)stack <
-           PAGE_SIZE)
-               stack = (unsigned long *)task_stack_page(task);
-
-       while (on_stack(info, stack, sizeof(*stack))) {
-               unsigned long addr = *stack;
-
-               if (__kernel_text_address(addr)) {
-                       unsigned long real_addr;
-                       int reliable = 0;
-
-                       if ((unsigned long) stack == bp + sizeof(long)) {
-                               reliable = 1;
-                               frame = frame->next_frame;
-                               bp = (unsigned long) frame;
-                       }
-
-                       /*
-                        * When function graph tracing is enabled for a
-                        * function, its return address on the stack is
-                        * replaced with the address of an ftrace handler
-                        * (return_to_handler).  In that case, before printing
-                        * the "real" address, we want to print the handler
-                        * address as an "unreliable" hint that function graph
-                        * tracing was involved.
-                        */
-                       real_addr = ftrace_graph_ret_addr(task, graph, addr,
-                                                         stack);
-                       if (real_addr != addr)
-                               ops->address(data, addr, 0);
-
-                       ops->address(data, real_addr, reliable);
-               }
-               stack++;
-       }
-       return bp;
-}
-EXPORT_SYMBOL_GPL(print_context_stack);
-
-unsigned long
-print_context_stack_bp(struct task_struct *task,
-                      unsigned long *stack, unsigned long bp,
-                      const struct stacktrace_ops *ops, void *data,
-                      struct stack_info *info, int *graph)
-{
-       struct stack_frame *frame = (struct stack_frame *)bp;
-       unsigned long *retp = &frame->return_address;
-
-       while (on_stack(info, stack, sizeof(*stack) * 2)) {
-               unsigned long addr = *retp;
-               unsigned long real_addr;
-
-               if (!__kernel_text_address(addr))
-                       break;
-
-               real_addr = ftrace_graph_ret_addr(task, graph, addr, retp);
-               if (ops->address(data, real_addr, 1))
-                       break;
-
-               frame = frame->next_frame;
-               retp = &frame->return_address;
-       }
-
-       return (unsigned long)frame;
-}
-EXPORT_SYMBOL_GPL(print_context_stack_bp);
-

 void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
                        unsigned long *stack, char *log_lvl)
 {
 void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
                        unsigned long *stack, char *log_lvl)
 {

diff --git a/arch/x86/kernel/dumpstack_32.c b/arch/x86/kernel/dumpstack_32.c
index e476eb7..06eb322 100644 (file)
--- a/arch/x86/kernel/dumpstack_32.c
+++ b/arch/x86/kernel/dumpstack_32.c
@@ -121,41 +121,6 @@ unknown:
        return -EINVAL;
 }
 
        return -EINVAL;
 }
 

-void dump_trace(struct task_struct *task, struct pt_regs *regs,
-               unsigned long *stack, unsigned long bp,
-               const struct stacktrace_ops *ops, void *data)
-{
-       unsigned long visit_mask = 0;
-       int graph = 0;
-
-       task = task ? : current;
-       stack = stack ? : get_stack_pointer(task, regs);
-       bp = bp ? : (unsigned long)get_frame_pointer(task, regs);
-
-       for (;;) {
-               const char *begin_str, *end_str;
-               struct stack_info info;
-
-               if (get_stack_info(stack, task, &info, &visit_mask))
-                       break;
-
-               stack_type_str(info.type, &begin_str, &end_str);
-
-               if (begin_str && ops->stack(data, begin_str) < 0)
-                       break;
-
-               bp = ops->walk_stack(task, stack, bp, ops, data, &info, &graph);
-
-               if (end_str && ops->stack(data, end_str) < 0)
-                       break;
-
-               stack = info.next_sp;
-
-               touch_nmi_watchdog();
-       }
-}
-EXPORT_SYMBOL(dump_trace);
-

 void show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
                        unsigned long *sp, char *log_lvl)
 {
 void show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
                        unsigned long *sp, char *log_lvl)
 {

diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
index 4e9f2cf..36cf1a4 100644 (file)
--- a/arch/x86/kernel/dumpstack_64.c
+++ b/arch/x86/kernel/dumpstack_64.c
@@ -140,75 +140,6 @@ unknown:
        return -EINVAL;
 }
 
        return -EINVAL;
 }
 

-/*
- * x86-64 can have up to three kernel stacks:
- * process stack
- * interrupt stack
- * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
- */
-
-void dump_trace(struct task_struct *task, struct pt_regs *regs,
-               unsigned long *stack, unsigned long bp,
-               const struct stacktrace_ops *ops, void *data)
-{
-       unsigned long visit_mask = 0;
-       struct stack_info info;
-       int graph = 0;
-       int done = 0;
-
-       task = task ? : current;
-       stack = stack ? : get_stack_pointer(task, regs);
-       bp = bp ? : (unsigned long)get_frame_pointer(task, regs);
-
-       /*
-        * Print function call entries in all stacks, starting at the
-        * current stack address. If the stacks consist of nested
-        * exceptions
-        */
-       while (!done) {
-               const char *begin_str, *end_str;
-
-               get_stack_info(stack, task, &info, &visit_mask);
-
-               /* Default finish unless specified to continue */
-               done = 1;
-
-               switch (info.type) {
-
-               /* Break out early if we are on the thread stack */
-               case STACK_TYPE_TASK:
-                       break;
-
-               case STACK_TYPE_IRQ:
-               case STACK_TYPE_EXCEPTION ... STACK_TYPE_EXCEPTION_LAST:
-
-                       stack_type_str(info.type, &begin_str, &end_str);
-
-                       if (ops->stack(data, begin_str) < 0)
-                               break;
-
-                       bp = ops->walk_stack(task, stack, bp, ops,
-                                            data, &info, &graph);
-
-                       ops->stack(data, end_str);
-
-                       stack = info.next_sp;
-                       done = 0;
-                       break;
-
-               default:
-                       ops->stack(data, "UNK");
-                       break;
-               }
-       }
-
-       /*
-        * This handles the process stack:
-        */
-       bp = ops->walk_stack(task, stack, bp, ops, data, &info, &graph);
-}
-EXPORT_SYMBOL(dump_trace);
-

 void show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
                        unsigned long *sp, char *log_lvl)
 {
 void show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
                        unsigned long *sp, char *log_lvl)
 {